linux-kernel - [PATCH 7/7] evm: Don't return an error in evm_write

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Date:   Thu, 20 May 2021 10:57:01 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <zohar@...ux.ibm.com>, <mjg59@...f.ucam.org>
CC:     <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH 7/7] evm: Don't return an error in evm_write_xattrs() if audit is not enabled

This patch avoids that evm_write_xattrs() returns an error when audit is
not enabled. The ab variable can be NULL and still be passed to the other
audit_log_() functions, as those functions do not include any instruction.

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 security/integrity/evm/evm_secfs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/integrity/evm/evm_secfs.c b/security/integrity/evm/evm_secfs.c
index ec3ed75a347d..07e263ae13e0 100644
--- a/security/integrity/evm/evm_secfs.c
+++ b/security/integrity/evm/evm_secfs.c
@@ -196,7 +196,7 @@ static ssize_t evm_write_xattrs(struct file *file, const char __user *buf,
 
 	ab = audit_log_start(audit_context(), GFP_KERNEL,
 			     AUDIT_INTEGRITY_EVM_XATTR);
-	if (!ab)
+	if (!ab && IS_ENABLED(CONFIG_AUDIT))
 		return -ENOMEM;
 
 	xattr = kmalloc(sizeof(struct xattr_list), GFP_KERNEL);
-- 
2.25.1